Cultivator tooth



Oct. 29, 1929. J, NOLL 1,733,358

CULTIVATOR TOOTH Filed Feb, 14, 1927 Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE HENRY J'. NOLL, OF MILWAUKEE, WISCONSIN CULTIV'ATOR TOOTH Application led February 14, 1927. Serial No. 168,013.

This invention relates to a cultivator tooth construction.

In cultivator teeth as heretofore constructed, it has been vthe usual practice to provide a bracket and a shank riveted thereto i@ or turning of the tooth. The result of this construction is that the earth plowed up by the tooth banks against the enlarged or widened shank portion and consequently causes clogging. In addition to this, the

earth is broken into relatively large chunks and is not suitably7 pulverized. Further, the widened shank contacting with the tooth would not adequately prevent turning as it was found impossible to hold the tooth in 2o intimate contact with the shank to such an extent that the widened face of the shank would become effective.

This invention is designed to overcome the defects noted above and objects of such in- 25 vention are to provide a tooth construction which utilizes a relatively narrow shank which may be no wider than the bracket and which is provided with means of a novel type to adequately prevent turning of the tooth v and also to torce the tooth into binding engagement with the base of the shank.

Further objects are to provide means for powdering up or breaking up the earth as it passes over the top of the tooth without, however, any danger of clogging as has heretofore been the case with the standard construction described above.

Further objects are to provide an eminently practical and simple construction which may be cheaply manufactured, which may be readily applied, and which automatically locks the tooth against turning and forces it into binding engagement with the bottom of the shank.

Y 59 section;

Figure 3 is a sectional view on the line 3 3 of Figure l;

Figure 4 is a view corresponding to Figure 3 showing a modied form.

Referring to the drawings, particularly Figures l, 2, and 3, it will be seen that the tooth is carried by usual bracket l which has permanently secured thereto the usual shank 2. The shank, however, is modiiied to the extent that it is of the same width throughout and does not widen at its lower end where it contacts with the upper face 'of the tooth 3 as has heretofore been the custom. This shank 2 may be riveted to thebracket, as indicated, or securedin any conventional way.

The bracket widens at its lower portion and provides a bearing head 4 against which the back of the tooth contacts. This bracket is provided with a plurality of spaced nibs or projecting lugs 5, three of such lugs being shown in the form illustrated, although obviously, any number could be employed. The tooth is correspondingly recessed, as indicated at 6, and is held clamped tightly against the head 4, with the lugs or projections 5 socket-ed within the recess 6 so that the tooth is'held in a secure manner against turning. Further, it is to be noted that the upper face of the tooth is slightly recessed to provide a bearing tace 7 contacting with the bottom end of the relatively narrow shank 2.

The means for holding the tooth tightly against the-bearing head of the bracket and also wedged upwardly against the bottom oi the shank 2 comprise a bolt 8 (see Figure 3) whose head 9 is countersunk in the tooth and is also provided with a cylindrical portion 10 accurately fitting the cylindrical portion of the aperture in the tooth. This bolt is provided with a nut 11 which bears against ing rides on the slanting face l2 of the aperture and forces the tooth 3 upwardly, so that its top edge 7 contacts firmly with the bottom edge of the shank 2 vand thus additionally locks the tooth against rotation.

The converse of the construction just shown may,.of course, be used as illustrated in Figure f4. In thfisacase, the ,portion 4 of the bracket corresponding to the portion 4; is provided with an aperture 'whosebotto-m edge slants rearwardly ylas ind'icaft'edat 1Q. A bushing 13 similarly contoured fits within the aperture and is forced inwardly"by1`n`eans of the nut 1l of the bolt 8. 'llh-is-eausesfthe .v tooth 3 to be forced upwardly into binding fengagenient withthe 'bottomofztlreshank 2. In addition to this, each of thesefconstructions f'causes't-he intimate locking oftheproj ections 5in the recess 6 ofthe tooth.

:Itfis'rto be noted that the Cylindrical porvtion '10 of the countersunk `head of 'the bolt engaging within -the v cylindrical portion ot' -the fagperture through *the rtooth -ggives -a @firm :bearing lfor thefbolt against the tooth and fservesto transmit the .upward thrust impart- `edtoI thebolt fhy lthe `'camwv'ashe'r or vbushing vO'I'lle-l.

,fIfn order to-insure the adequate pulveri'zing of theear'thor-soilra pair'off outwardly-*slantingor-divergentitines 14 lare carried by the fheadft of the bracket, as shown in `Figures l.1 '-and';2. 5Ihese'tines may lconsist of round rods whose flower ends :are `threaded 'into ythe bracket, 'as shown, `the bracket being provided with suitable loffset .portions't-o afford fade- @nate b'earing'sinfaceforfthe tooth and also to "carry the t-ines. These tines :provide a .gradually increasing 'space between themvselves land fthefsh-ank 2,so 'that it 'is impo ssi-ble forearth -to wedge between :the tines fand vthe sha-nk. Fortexempla-if a clodof earthV should temporarily lbecome lodged between a tine and a-shankoffthe tooth in'th'e ordinaryy operation 'ofthe machine, :it would be fimmedi- A'ately raised by the inwardly Y'passing earth and, consequently, would move upwardly be- Atween the tine and the shaikfand be dis- 'charged vin the Ilarger portion loffthe l'space "between such tine and sha-nk. In vlthis way, it isutterlyi-mpossible -to ologth-e tootli-construction of this invention. -In addition, it rhas been found jthat 'the tines=thoroughly fpulveriZe-the earth ina moreefective 'manner than :has heretorfore been fpossible.

v'said bearing headfsai-'d bearing head having a camfshaped aperture through which said 'bolt projects, a cam-shaped bushing carried by said boltand cooperating with said aperture to force said tooth upwardly into binding.engagementwviththe lower Ytace, of said shank, and cooperating means carried by said .tooth 'and bearing-'head --for resisting rotation `of said fto'oth relatively vto -saidbraoket Ingtestimony -that -I Yclaim the `Jforegoinjg YI have 4hereuntogset "my-hand at Milwaukee, in the county of .Milwaukee .and State of Visconsin. y

HENRY J. NOLL. 

